Locating and forced pullout device of a guide rail in a drawer

ABSTRACT

A locating and forced pullout device of a guide rail in a drawer comprises an inner rail, an intermediate rail and an outer rail. The inner rail provides an elongated groove at the rear side thereof and a stop part is disposed in the groove. The stop part has an upward slant toward an end thereof and is joined to the inner groove vertically. The intermediate rail is sliding relative to the inner rail and provides an elastic frame at the rear side thereof with a central frame hole. Also, the elastic frame has a respective upright rim at two opposite lateral sides. The elastic frame can catch the stop part to form a state of locating as soon as the drawer is pushed back and the engaging edge presses the elastic frame. The elastic frame separates from the engaging edge and bounces back to allow the stop part separating from the elastic frame as soon as the drawer is pulled out.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a locating and forced pulloutdevice of a guide rail in a drawer. In particular, the present inventionrelates to a locating and forced pullout device, which perform aneffective function of locating the drawer after pushing the drawer intoplace and pulling out the drawer in a forced way.

[0003] 2. Description of Related Art

[0004] Drawers have been popularly used in furniture, office desks,cabinets, and etc. The drawers can contain articles and can be pulledout and pushed into place conveniently so that they can be long lastingand impossible to be replaced.

[0005] Usually, a drawer basically is an open box with a lateral sidethereof being joined to a slide rail and the slide rail is inconjunction with an inner wall of a drawer space preserved in thefurniture. Hence, as soon as the drawer is pulled, the slide rail movesto allow the drawer being pushed into place or pulled out smoothly. Fora larger drawer, there slide rails are utilized, that is, an outer railencloses an intermediate rail and the intermediate rail encloses aninner rail such that adjacent rails can slide relative to each other toperform the operation of pulling out and pushing into the drawer.

[0006] In fact, when the drawer is pushed into place, it is necessaryfor the drawer to be located well with a locating device so as not tofall off automatically. If the locating device is provided withexcessive tightness or firmness, a greater force has to be exerted whilethe drawer is pulled out so that the user may not feel smoothly. Hence,how to design a slide rail with a function of excellent locating andforced pullout is a subject pursued by the makers. Especially, it ismuch harder for the preceding three slide rails.

SUMMARY OF THE INVENTION

[0007] A locating and forced pullout device of a guide rail in a draweraccording to the present invention comprises an inner rail, anintermediate rail and an outer rail. The inner rail provides anelongated groove at the rear side thereof and a stop part is disposed inthe groove. The stop part has an upward slant toward an end thereof andis joined to the inner groove vertically. The intermediate rail issliding relative to the inner rail and provides an elastic frame at therear side thereof with a central frame hole. Also, the elastic frame hasa respective upright rim at two opposite lateral sides. The elasticframe can catch the stop part to form a state of locating as soon as thedrawer is pushed back and the engaging edge presses the elastic frame.The elastic frame separates from the engaging edge and bounces back toallow the stop part separating from the elastic frame as soon as thedrawer is pulled out.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention can be more fully understood by referenceto the following description and accompanying drawings, in which:

[0009]FIG. 1 is a perspective view of a locating and forced pulloutdevice for a guide rail in a drawer according to the present invention;

[0010]FIG. 2 is a sectional view illustrating the locating and forcedpullout device of the present invention in a state of locating; and

[0011]FIG. 3 is a sectional view illustrating the locating and forcedpullout device of the present invention in a state of being forcedpulling out.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Referring to FIGS. 1 to 3, basically, a guide rail in a draweraccording to the present invention comprises an inner rail 1, anintermediate rail 2 and an outer rail 3.

[0013] Wherein, the inner rail 1 is enclosed before being pulling outand is disposed at the outermost position while it is pulled out. Theinner rail 1 at a side thereof (the lower side shown in FIG. 1) has aconventional connection part to be joined to the drawer box and nodetail will be described further with regard to the conventionalconnection part. The inner rail 1 at another side thereof is theinvented part, that is, a stop part 12 is mounted to the inner rail 1 onthe inner groove 11 thereof. The stop part 12 has a slant arm to performa function of catching and can be made by way of stamping integrallywith the inner rail 1 or another part joined to the inner rail 1.

[0014] The intermediate rail 2 is a slide rail disposed at the middlesection of the inner rail 1 and can slide with conventional balls atlateral sides thereof with respect to both of the inner rail 1 and theouter rail 3. This is prior art and no detail will be described further.The intermediate rail 2 has a rise part at an end thereof and the risepart is an elastic frame 21. The elastic frame 21 can be integrated withthe intermediate rail 2 or another part provided on the intermediaterail 2. The elastic frame 21 has a central frame hole 211 and at twoopposite lateral sides thereof has an upright rim 212 respectively. Bothends of the elastic frame 21 provide chamfer ends and the size of theframe hole 211 is greater than the stop part 12 so that the stop partcan be received therein.

[0015] The outer rail 3 covers the intermediate rail 2 and at the frontend thereof is stamped a downward V-shaped engaging edge 31. Theengaging edge 31 at the center thereof has a rim line 311, which is thelowermost spot thereof, and a rise is formed from the engaging edge 31toward the front end and the rear end thereof respectively.

[0016] Referring to FIGS. 1 to 3 again, in case of the drawer beingpushed backward into place, the inner rail 1 is moved with the drawer toresult in the stop part 12 at the front end thereof lifting the elasticframe 21. Then, as soon as the drawer is pushed inward further, the stoppart 12 can be inserted into the frame hole 211 of the elastic frame 21first and then presses downward to enter the outer rail 3 due to beinghindered by the engaging edge 31. Once the elastic frame 21 passesthrough the rim line 311, the drawer becomes in a state of locating andthe inner and the intermediate rails 1, 2 are unable to move outward.

[0017] In case of the drawer being pulled out, the drawer box isextracted and the elastic frame 21 may separate from the engaging edge31 to bounce back such that the it is possible for the stop part 12 topass over the elastic frame 21 and the drawer box can be pulled outsmoothly.

[0018] It is appreciated from the preceding embodiment that the locatingand pullout device according to the present invention can offer a muchmore effective function of locating and pullout than the prior art does.

[0019] While the invention has been described with reference to thepreferred embodiment thereof, it is to be understood that modificationsor variations may be easily made without departing from the spirit ofthis invention, which is defined by the appended claims.

What is claimed is:
 1. A locating and forced pullout device of a guiderail in a drawer, comprising an inner rail with a rear side, providingan elongated groove at the rear side and a stop part being disposed inthe groove, the stop part having an upward slant toward an end thereofand being joined to the inner groove vertically; an intermediate rail,being sliding relative to the inner rail, providing an elastic frame ata rear side thereof with a central frame hole, having a respectiveupright rim at two opposite lateral sides thereof with two archedchamfer ends on the respective upright rim, and the frame hole having asize not less than the stop part; and an outer rail, being sliding withrespect to the intermediate rail, providing a downward engaging edge ata rear end thereof; whereby, the elastic frame can catch the stop partto form a state of locating as soon as the drawer is pushed back and theengaging edge presses the elastic frame; the elastic frame separatesfrom the engaging edge and bounces back to allow the stop partseparating from the elastic frame as soon as the drawer is pulled out.2. The locating and forced pullout device of a guide rail in a draweraccording to claim 1, wherein the inner rail, the intermediate rail andouter rail are made of metal.